Downhole Mixing Apparatus with Piston Agitator
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Solution Overview
Problem
Current downhole mixing technologies lack the ability to achieve precise and controlled mixing of fluids in subterranean environments, particularly in oilfield applications, where quantitative measurements and minimal contamination are critical, especially when dealing with emulsions and nanoparticles.
Innovation Solution
A downhole mixing apparatus featuring a chamber with a piston and agitator mixing device, where a fluid delivery system supplies a known volume of a first fluid and a third fluid to position the piston, and a pressurized second fluid is used to partially mix the fluids, with an actuating device reversing piston direction to agitate the mixture, enhancing surface area for reaction and mixing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional downhole mixing tools are used, then fluid sampling and analysis can be performed, but precise controlled mixing with exact mixing volumes cannot be achieved
Solution Approach 1:
The piston is designed to automatically position itself at a predetermined location within the mixing chamber based on the volume of the first fluid introduced. This self-positioning mechanism eliminates the need for complex external control systems to achieve precise mixing volumes, as the piston's position is determined by the fluid volume itself and the chamber geometry
Solution Approach 2:
The system utilizes changes in fluid pressure and volume parameters to control the mixing process. The second fluid is introduced at a pressure that moves the piston to a second position, and the actuating device applies pressure to reverse the piston's direction. These parameter changes enable precise control of mixing volumes without complex mechanical control systems
2Productivity
If piston agitation is used to mix fluids, then mixing efficiency increases, but the complexity of the actuating device increases
Solution Approach 1:
The actuating device utilizes pneumatic or hydraulic pressure to move the piston back and forth within the mixing chamber. By introducing the second fluid at controlled pressure and using the actuating device to apply reverse pressure, the system achieves efficient piston agitation and fluid mixing without requiring complex mechanical drive mechanisms
Solution Approach 2:
The piston's movement is driven by the pressure differential created by the introduction of the second fluid and the actuating device's pressure application. The system uses the fluids themselves and simple pressure mechanisms to drive the mixing action, avoiding the need for complex external actuation systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables effective mixing and increased reaction efficiency, reducing operation time and improving mixing quality, allowing for precise fluid manipulation and measurement in downhole tools, such as gas scrubbing and colorimetric sensing.
Implementation Method 1
the second fluid is supplied to the chamber from the first opening at a pressure that partially mixes the fluids and moves the at least one piston from the first position to a second position
Implementation Method 2
the actuating device applies a second pressure reversing the direction of movement of the at least one piston from the first end toward the second end of the chamber, wherein the movement of the at least one piston agitates the fluids
Data Source
AI summary
Methods and devices for mixing a first fluid with a second fluid downhole include a chamber having a first end, a second end and an opening for fluid to flow there through. A top surface of a piston is capable of contacting the second end of the chamber. The piston is located at a first position within the chamber based upon characteristics of a second fluid. A fluid delivery system supplies the first fluid and supplies a second fluid through a first opening of the chamber, wherein the second fluid is at a pressure that moves the piston approximate to the second end of the chamber. The piston includes an agitator mixing device that is attached to a bottom surface of the piston, wherein mixing of the first fluid with the second fluid primarily occurs upon movement of the piston by actuating device.